Multiple v-belt pulley



Sept- 9, 1947. H. OQWILLIAMS 2,427,172

'MULTIPLE v-BELT PULLEY Filed Dec. 31, 1943 4 Sheets-Sheet 1 FIG. I.- 57 2 3 56 5e 22 5g 2o 3e 45 17 5e 57 5? 5o 43 5e 55 4e 59 A I l y 32 25 25 25 26 H. O. WILLIAMS MULTIPLE V-BELT PULLEY sept. 9,1947.

Filed Dec. 31, 1943 4 Sheets-Sheet 2 y FIG. 5.

Patented Sept.` 9, 1947 uNrrEDsTATEs PATENT OFFICE y p 2,427,172 MULTIPLE v-BELT PULLEY Howard ovvimams, Minneaptus, Minn. Appucauon'necember a1, 1943, serial No. 516,553

1 My invention relates to multiple V-belt pulleys and the method of forming same, and has for its purpose to provide a V-belt pulley which with a single basic casting may simply `and readily be assembled with as` many belt grooves thereon as is desired. Also in one of its forms the belt grooves may be varied in width to receive beltsof differing sizes.

f In many types `of driven machinery the` drive is effected by a multiplicity of what are known as V-beltsrunning over pulley members having generally, and broadly considered, V-type annular grooves for receiving the V-belt. InV practice the V-belt ordinarily is rhomboidal in sh'ape instead of a true V, and the rfrictional driving contact with the pulley is made by the obliquelydisposed outwardly diverging sides of the belt. The V-belts also are of different sizes according to the load placed upon them, but in all cases the driving contact is made with the obliquely disposed side walls of the belt, in this respect differing from ordinary iiat belts where the driving contact is made with the full race of the belt.

Since the v-belts are, of dierent sizes, the belt grooves must be correspondingly of different sizes. The diiierences, both as` to belts and grooves, are generally found in the `overall width of the belt and corresponding` width of the groove, that is in the spacing of the oblique walls diverging outwardly in the grooves and contracting inwardly in the belts. These differences, that is that anywhere from two to five or more belts and sets of grooves may be employed and from one to four or more diierent widths of belts and grooves may be employed, have resulted in` the necessity of having a large` number of patterns or dies, greatly adding to the expense ofxnanufacturing and maintaining a stock of pulleysand belts to meet the requirements ofthe several sets and sizes. and equally adding tothe cost of replacement when a part of such a pulley is broken.

I` have discovered that by the use of a hub c claims. (ol. 'i4-230.1)

'Ihe hub member may be long enough to provide for holding a predetermined number of pulley discs, and for larger pulleys, that is pulleys with a larger number of V-grooves, sectional hubs canlbe added with or without an additional t securing flange. l

splined on the drive shaft and having an integral securing flange and by providing separate pulleydiscs, the same may be secured to the hub and the V-groove or grooves be formed `by bolting together on the hub two or more of these discs depending upon the are required.

number of V-grooves which fore, to provide a multiple groove pulley wherein a greater or less number of groove making elements will be rigidly secured to the drive shaft, the number of Y-grooves being variable` to a greater or less degree as the nstrumentalities to be driven may require. f

It is a further object of my invention to provide a multiple V-.belt pulley wherein there is splined to the driving shaft a. hub provided with an an-v nular securing flange, in combination with a multiplicity of groove-formingmembers, said members being bolted together and also bolted to the iiange of the hub. Itis a further object oi'lmy invention, in combination with' a hub secured tothedriving shaft and having an annular securing ilange,` to `provide a multiplicity of groove-forming members mounted on the hub and bolted thereto, and also to provide hub extensions whereby application of identical additional groove-forming members may be made to suitably increase the number of V-grooves of the pulley.

It is a further object of `my invention, where hub extensions are employed for a, lconsiderable of the invention.

as may be requisite to provide a multiple V-belt pulley with the number of V-grooves required.

It is a further objectof my invention to employ groove-making discs having bevelled faces diverging from the annular edge of and adjacent the transverse central planes of the discs and mounting said discs upon a drive shaft or a hub on the drive shaft, .with washer-like spacers between them, whereby a broadened V-groove is obtained. It is a further object of my invention to form the faces of the groove-making discs with a depressed annular portion on one side and a protruding annular portion on the other side, correspondingly adapted to fit together, and to secure said groove-making discs. together with the protruded portions fitted into the depressed portions, and to secure such an assembled group of groove-making discs to a drive shaft or to a l'i'ub The full objects and advantages of my invention will appear in connection'withthe detailed description thereof which will now be given in the following specification, and the novel features of the invention from'whichvare obtained the aforementioned advantageous results and improved structures will be particularlypointed out in the claims.

In the drawings illustrating applications of my invention in one form: y

Fig. 1 is a longitudinal sectional view of a multiple feed belt drive pulley in a preferred form Fig. 2 is an endv view oi.' Lthe parts shown Iin Fig. 1.

Fig. 3 is a longitudinal sectional view through a multiple V-belt pullel',l showing a series of specially formed groove-making discs secured to the i series of V-grooves.

Fig. 4 illustrates a similar arrangement; in which the V-grooves are widened bythe use of spacers of a distinctive shape.

Fig. 5 is a view of a series of dis'cs having annular depressed and offset portions andk intervening spacers of a greater width than those disclosed in Fig, 4, whereby the V-groove is still fur-ther widened.

Fig. 6 is va sectional view similar tov Fig. 5 wherein the double vspacing effect is brought about bythe use oi a pair of spacers similar to those shown in Fig. 4.

Fig. 7 is a2 sectional `view similar to Fig. 3 wherein the parts are heldtogether with the use of a hub on the drive shaft.

Fig. 8 is a sectionalview similar to Fig. 7 with spacer plates applied between the groove-forming discs which have an annular protruding portion at one side and a corresponding annular depressed portion at the other side.

Fig. 9 is anv end elevation view of the parts shown in Figs. 7 and 8.

Figs. 10, 11, and 12 are-cross-sectional views of standard V-belts of three common sizes.

Fig. 13 is a longitudinal sectional view of a multiple V-belt pulley formed of 'a series of complete V-groove elements secured to the drive shaft through a single hub thereon.

Fig. 14 is a sectional view similar to the section of Fig. 13 showing a hub extension for permitting the securing of a multiplicity of groove-forming members to a driving shaft.

Fig. 15 is a sectional view similar to Figs. 13 and 14 wherein the hub extension is itself provided with an annular flange and the inner margins of the hubs are held slightly spaced from one another for providing a V-belt pulley of a large number of V-drive grooves.

Fig. 16 is an end elevation view of the drive pulley arrangement. shown in either Fig. 13, 14,

Fig. 17 is a plan view on a reduced scale of one of the spacing washers.

Referring first to Figs. 1 and 2, I5 is any driven shaft, which may be mounted in any desired re- 20. lation to operate any of numerous different forms of devices, such-for example as grain cleaning machines of one type and another. At one end I8 of shaft I5, as shown, or in practice to any desired point along the length of the drive shaft, is keyed a hub I1. This hub, as best shown in Figs. 2 and 14, is provided with a cylindrical body portion I8 with an annular front projection I9 and an annular outwardly extending circumferential flange 20. The sleeve I8 is keyed to lthe shaft I5 as indicated at 2| in Figs. 2 and 6. A flange 20 in the form of Fig. 1 is provided with an annular cut-out portion indicated at 22 in Fig. 1 which leaves an annular extruded rim 23 surrounded by the annular cut-out portion 22.

Upon the sleeve I8 of the hub I'I is mounted a series of groove-making discs 24. In the form of the invention shown in Fig. 1 there are seven of such groove-making discs which produce six V-grooves 25. The several groove-making discs 24 are identical in construction. Each of them is formed by a body portion with a cylindrical outer rim 26 and with a circular inner opening 2'I adapted to engage and seat closely upon the outer circumferential area 28 of' the hub sleeve I8.

Each of the groove-making discs 24 is provided with. obliquely disposed faces 29 and 30 which diverge inwardly from the edges of the cylindrical outer rim- 26, and which are symmetrically disposed with respect to the central transverse plane of the groove-making discs 24.

Disc 24 is also provided with an annular cutout portion 3|,.Fig. 1, which is adapted to receive the projected portion 23 of the hub-flange 20, as clearly indicated in Figs. 1, 3, and 4. The cutout portion 3| is formed through the outer face 32 of the disc 24, and the inner part thereof extends into the hub-receiving hole 21. The disc 24 likewise has an outwardly projected portion 33 extending from the inner face -34 of the disc 24 of a size and position complementary to those of the cut-out portion 3|. The cut-out portion 3| is also of the samesize and position of the protruded portion 23 of the annular hub flange 20 so that such protruded portion may be fitted into the cut-out portion 3| of an initial grooveforming disc '24, as clearly shown in Figs. 1, 3, and 4. It also follows that each of the protruded annular portions 33 of the groove-forming discs 24 is adapted to seat and fit closely in the cut-out portions 3| of a succeeding disc 24.

In the form of the invention shown in Figs. 1 and 2 there is a symmetrically disposed complementary hub member 35. This has a sleeve portion 36, and an extension 31 thereof with a centra1 shaft-receiving hole 38 which are substan- .tiallyy the sameas1the sleeve I 8, `thefextensionl |19, and the shaft-receiving holeA I 8' of therhub member I1. "Thehubr35 hasanintegrallydonnediannular `flange .38 `which `differs from. the ange 206 on the hub I 1, for the :flange 138 i has 'no1 annular cut-out part 422 orV annular extended partZBbutl is providedwith a straight `innerwall391'which receives directly against a it the protruded portion 33 of the groove-forming disc24.. 1 i

In anv assemblage i of .the". type; disclosed in Fig. 1 there must be avery rmz.-andtunyielding:hold of the parts fto'gether. `Thisis effectedby two sets ofpowerful bolts. Eachl of` thegroove-making: members *24'1 is provided witha bolt-hole 140i The several bolt-holes 4U i are nso positioned-adiacenti the inner `circumferential holes 21 of grooveforming `members `.24` that when they aref assembled upon hub member I1' and `extensionfhub The length of the hub member sleeves is'so` proportioned `tothe breadth of the `entire `assemblage that the inner ends of thehub sleevesare spaced apart asshownat 41 in Fig. 1.` Therefare a` multiplicity ofibolts43 with their integral heads 4'4,..as shown in Fig. 2. It follows that whenfthe nuts 45-areiturned up on the"threaded.ends`46"` of bolts 43, `pressure will be exerted upon the ilange 2`0uofhub|1 andtheange 38 of hub35; This pressure `will be equally distributed about the shaft I5, andl since the two hub` members vI1 and 35 can movetowardeach otherbecauseof the space 41 .betweenl their ends, the `pressure-is exerted uniformly upon theV entire group ofv4 groove-forming members '24, thus `veryf'rmly` uniting-them with thehubi'members` I1 and3i5l which `are splinedontlie` shaft Where no spacers are present between grooveforming members 24 theresult willibe asilnple V-groove, as shown'inFig. 3. Thisgroove would be adapted torecelvethe'smallest V-beltfsuchas V-belt A shown in Fig.` 10. However, illustrated in`Fig. .1, spacers `areemployed which `separate the groove-forming discs i24fasulc`ient distance to receive a `considerably largersize V-belt such as Y the vbelt designated vas CvinfFlg. 12. -Asrbestshown in"Figs1 and '1, thesespacers are washer-like members formed withsacentral` circular hole 49 `ofa diameterequal to. that ofithel hub I1for hubs Hand-315; oriof a loneshat 45" upon which they spacers may be positioned;V

These spacers, like thefgroove-forming discs v24, are. provided withubolt holes 50 adapted' to receive the bolts 43. The outer-surface ofthe spacers,` indicated at 5I, is a` cylinder of i a` diametersuch that the spacers lie. betweenthe1 body portions "of groove-forming discs 24 reaching only 't'Q the discs `1 are likewise provided *with correspondingly i. sizedvland' positionedfbolt zholes55. Anzl additional `tivelyshort.huloiilltvhich` is provided with an annular flange @El 4Amseries -of groove-forming discs i162 1 are sappliedulto I'thehubffil and have the same cylindrical.` outerlrims -26land, sloping side .wal1s:2.9 and?!llasflarefpresentinxthezdiscs 24 heretoforef` described. .'Ihese discs have an annular -cut-outfportionzxladapteditoseat upon `the an- .nular insidewall "64 of i theange 6 I'. The discs .52 falsorhave yanannularprotruded portion 65 `whichis adaptedtoffseatf in theLcut-out portions 63" of succeeding groove-'forming discs 82.

These groove-forming discs are provided with theouterfcircumference#B1 of-'thecylin'dricalbody beginning ofthe oblique side walls 29iand 130' thereof. The spacers alsoare `formedwith cut.

out portions f 52. and `protruded. portions "53. lThe cut-out `portions 52 of the spacers 48 receive l:the protruded portlons`33 ofthegroove-forming discs `24. Likewise the protruded portions 53n of the spacers 48 `enter and are received by the 'cut-out portions 23 ofthe groove-making disc '24.

`wallsiofthe groove-formingxdisc"62.

alignwithia boltholf'IUintfthe flange 6I. Strong Vbolts *1 Ii are provided with headsf12 engageable ywith thdange TGI. "These bolts extend through the llangeholeli'andthe bolt holes 69. The bolts-TI are Aprovidedwvith threaded ends 13 upon which :are ffscrewed" `nuts 14 engageable directly with the proi ectingportion-f. otthev last grooveformingridiso.

Thegroove-forming discs "821 differ from the discs: 24 in ithatlthey rlflave norsecon'd set of bolt `holes and,arewrrot-=secured` by asecond set of `boltsssuch.asftheuboltsiiftii' Figs. 1 and 2; Also, as shownin` `1.'li'g.'3,` there 'are no spacers, the `grooves .15? beingfformed by direct contact of the The grooves `151a;re thusliully W-shapedand are `adapted to 'receive'fthesmallestftype v-belt lA shown in Fig. l0.`

Such. a ,lpulleyfwill zl in `general .not be provided with morethan two or threel grooves 15 and hence 'willbemountedupon a single hub. The

the lightertypenfV ldrivin'gawork.

The\groove=making1di`scs :of Fig. 4` are identi- 'cally the same asfthe groove-making discs of Fig. `Blandneed-:init .further be i described. The zcons`tructicin--oifl `lilg.r4wso'`faras vthe mounting of'fhub 1.6M upon.` .shaft `I5 is identically the same 'asinfl'iigt-S. -Flg.u?4,.howevenlillustrates the use ko! spacers lwhichware formed `with annular depressed portions'l which `engage and match I into the. annular :recessed portions 163 Vand j pro- -Ltruding"portions'liasxshowniinfFig. 4. This ar- 4rangement'.` formsy a groovefl AWider than the groove" T51-which. is `adapted -lto receive. `and `be ldriven .by a medium sized V"belt, .1such `as `the beltliBiofFig. 11.

4Inftheform loi `therinvention.'ofifFigs.- 5, 6, '1, and `8, no I hubs `are employed.` The `groove-forming 'discsfare--unitedfdirectly ito the drive 'shaft I5 I by meanszofisza-fspline 11180 1' which, :as clearly shown,

The groove-making discs 242 are providedlwith` n seats insalongitudinali groove indicated by dotted linesfat BI. Thisfsplinenas clearlyrshown, has a i considerablerpartof` its.l body' outside the circumand last groove-forming discs 82.

7 ferential limits of the shaft l5. This extended portion of the spline is seated in transverse grooves on the inner edges across the circumferential margins of the groove-forming discs or of those discs and any spacers which may be used between pairs of discs.

As shown in its simplest form in Fig. 7, grooveforming discs 82 have cylindrical top margins 26 and oblique side walls 29 and 30 similar to the outer margin and oblique side walls of the grooveforming discs 24 and 62 heretofore described. The groove forming discs vare provided with central openings or holes 83 which receive directly the drive shaft I5. Otherwise the groove-forming discs 82 arequite similar to the groove-forming discs 62. They have annular cut-out portions 84 and annular extended portions 85 mutually engaging and tting in one another in the same manner, except that these portions run down to the shaft I5 itself rather than to a cylindrical .sleeve portion of a hub, such as body portions 68 of hub 60.

There also are transverse aligned grooves across the inner faces of the groove-making discs 82 cut in through the cylindrical surfaces 83, which are indicated in dotted lines at 86, there being a multiplicity of groove-forming discs 82 (as shown in Fig. 7, three in number). These discs are held, with adjacent faces of pairs thereof in contact and with the protruding portions 85 seated in the cut-out portions 84, by means of bolts 81, which extend through aligned openings 88 in the groove-forming discs 82 and engage with heads 89 the outside face of the rst of such groove-forming discs 82. These discs 82 are secured together by nuts 90 on threaded ends 9| of the bolts 81, the bolt-heads and nuts contacting directly the outside faces of the first This arrangement gives a very simple structure substantially lidentical with that shown in Fig. 3 and havingv the same V-grooves 15, except that the construction of Fig, 7 has the groove-forming discs 82 directly splined upon the drive shaft I5 and thus eliminates the use of a hub.

In the same manner the structure shown lby Fig. 8 is similar to the showing of Fig. 3 with the same spacer strips 16 and the same belt grooves 11 adapted to receive the type B V-belts of Fig. 11, and, of course, with no hub such as hubs 24 and 60. Fig. 5 illustrates a construction similar to that of Fig. 8 except that onlythe interior groove-forming discs 62 are the same as the groove-forming discs 82. rIn this form of the invention the end discs 92 and 93 are provided with a series of complementarily positioned countersunk openings 94 and 95 respectively, which are adapted to receive the bolt heads 96 and nuts 91. In this form, also, the elements making up the multiple V-belt pulleys are directly splined to the drive shaft I5 and are held together by bolts 98 with the heads 96 and nuts 91 located in counter-sunk recesses in the special groove-forming discs 92 and 93. In this form also a single wide spacer 99 is positioned between pairs of groove-forming discs as between centrally located discs 62 and end discs 92 and 93. These spacers produce a wide form of V-groove which is adapted to receive the larger size of V-belt indicated at C in Fig. 12.

The assemblage shown in Fig. 6 is exactly the same as that of Fig. except that in place of a single thick spacer 99, as used in Fig. 5, the construction of Fig. 6 uses a pair of the narrower spacers 16 employed in the construction of Fig.

gether with any spacer 16 multiples of 16 or thicker spacers 99, which may be used.

In Figs. 13, 14, 15, and 16, a modified form of the invention is disclosed. In this form, referring first to Fig. 13, specially formed discs I0| are provided. These discs are mounted upon hubs I1 or upon complementary hubs I1 and 35, in substantially the same manner as is true of those hubs in the construction illustrated in Fig. 1. Or they may be mounted on a hub I1 and an unflanged extension I1. The hub members I1 and 3 ,where the latter is used, are formed likewise with annular flanges 20 and 38, respectively.

Each disc IOI has a cut-out annular. portion 23, a protruded annular portion 3|, and ts closely upon a'hub sleeve 36. They are secured together by bolts 43 and bolts 56 in substantially the same manner as in Fig. 1. The difference resides inthe fact that the V-belt grooves are fully formed in the discs |0I. These discs preferably have parallel plane walls, preferably with an annular groove portion |02, and have extending down inwardly from their outer circumferential limits |03 an obliquely walled groove |04 formed of inwardly convering side walls |05 and |06 and with cylindrical bottoms |01, as clearly shown in Figs. 13, 14, and 15 and as indicated in dotted lines in Fig. 16.

As shown in Fig. 13, a three groove pulley is constructed mounted upon a single hub sleeve I8 and having the discs I0| forming it, held together by bolts 43 and 56 in substantially the same manner as the groove-making discs 24 of Fig. 1 are held togetherl it being noted that in Fig. 15 there are a pair of hubs I1 and 35 just as there are a pair of hubs I1 and 35 in the structure of Fig. 1.

In this form of the invention there is a separate and complete groove for each of the discs IUI. Hence, in this form of the invention spacers can not be used, but the particular sized groove for a given V-belt must be formed in the discs |0| themselves, which makes it necessary to have as many different groove sizes of discs as there are different sizes of V-belts to be used therewith As shown in Fig. 14, a hub extension I1 without any flange such as the flange 38 of the complementary hub 35 of Fig. 1 may be employed. This will simply be a hub cylinder extension |08', of the requisite length for extending the hub to receive the desired number of groove discs IOI, which will be engaged over their outer end surfaces bythe inner surfaces of nuts 45 on the bolts 43 as shown in Fig. 14, there being a slight spacing indicated at |08 of Fig. 14 between the adjacent annular end portions of the hub |1 and the hub extension I1'. Instead of the nut-head only to engage the outer end of hub cylinder extension |08', a washer |09 under the nut 45 may be em- 9 of V-belt pulley the number of pulleys can be varied up to any maximum desired. It is also truen that while I have shown in all forms of my invention here presented pulley assemblages in which all the pulleys are of the same diameter, none the less in any of the forms of the invention series of pulleys stepped up from a smaller diameter to succeeding larger diameters may readily be obtained by simply using pulley-forming discs or V-groove special discs of successively larger diameter mounted upon the drive hub or the `drive shaft, which will give stepped up pulleys of the same extent and efficiency as the single-casting Y stepped up pulleys n'ow in use.

Other advantages of my invention have quite clearly appeared in connection with the description thereof on the preceding specification. The primary advantage resides in production of multiple V-belt pulleys having any-desired number of pulley grooves from a minimum of two up to the maximum number of pulley grooves whichare ever required, and accomplishing this through the use of groove-forming discs or grooved discs, so that an entire multiple V-belt gear assemblage may be produced with the use of only a single casting or stamping. In the forms of the invention of Figs. 1-12 there is the further very great advantage of employing the same groove-forming discs with spacers which make possible a production of multiple V-belt pulleys adapted to work with V-belts of different widths.

I claim:

1. In combination with a driven shafta mulslightly spaced apart, a pair of annular flanges on the hubs at opposite ends of the respective drums, a selected number of discs which provide V-belt disc grooves at their outer circumferential limits, said discs mounted on the drum sec-l tions between said ilanges, a multiplicity of bolts extending through the bodies of the discs adjacent the drum sections and through the flanges, and a corresponding number of other bolts extending through the bodies of the discs only, all said bolts holding the discs in a firm and unyielding contacting body rotatably connected with the driven shaft through the drum extensions.

2` In combination with a-driven shaft, a multiple V-belt pulley which embodies a multiplicity of V-belt grooves, said pulley comprising a pair of hubs each formed with a drum extension on and contacting throughout its length thesaid shaft, the inner ends of said extensions being slightly spaced apart, a pair of annular flanges on the hubs at opposite ends of the respective drums, a series of groove-forming discs mounted on the ldrum extensions between the flanges, each disk driven shaft hrough the drum extensions.

3. In combination with a driven shaft, a'pair ofl hub parts splined thereon, each having an inte-4 gral drum extension contacting the shaft throughout its length, each hub part having an outer annular flange, the extensions extending toward each other and being slightly spaced apart at their inner ends, a series of groove-forming discs mounted on the drum extensions, each disc having a cylindrical outer face and obliquely disposed belt-contacting faces diverging therefrom, said discs being of substantial thickness and having radially extensive contacting faces, a multiplicity of bolts extending through the discs and the flanges close to the drum extensions toj hold the discs rotatably united therewith, and a second series of bolts extending through the disc of bolts.

4. In combination with a driven shaft, a series of groove-forming discs on the shaft, each of said discs being of substantial thickness and having a cylindrical outer rim and obliquely disposed belt contacting faces diverging therefrom and having annular radially extensive faces on each side, independent spacing members each having correspondingly annular radially extensive faces contacting adjacent faces of the discs for effecting a broadening of the V-belt grooves by said unchanged discs, and two sets of bolts one of which passes through both said disks and spacers adjacent said shaft and the other of which passes through both said disks and spacers adjacent the groove-forming portions thereof to hold said discs and spacers with their said faces contacting in an unyielding pulley mass and holding the entire pulley mass rotatably connected with the driven shaft. v

5. In combination with a driven shaft, a series of groove-forming discs on the shaft, each of said discs being of substantial thickness and having a cylindrical outer rim and obliquely disposed belt contacting faces diverging therefrom and having annular radially extensive faces on each side, independent spacing members each having correspondingly annular radially extensive faces contacting adjacent faces of the discs for effecting a broadening of the V-belt grooves by said unchanged discs, said faces of the respective discs and spacers each extending into complementary annular cutout and protruded portions positioned toward the drivenv shaft and contacting and interlocked to aid in holding the discs and spacers together, and two sets of bolts one of which passes through both said disks and spacers adjacent said shaft and the other of which passes through both said disks and spacers adjacent the groove-forming portions thereof to hold said discs and spacers with their faces and the cut-out and protruded portions thereof in a laterally contacting unyielding pulley mass and holding the entire pulley mass rotatably connected with the driven shaft.

-6. In combination with a driven shaft, a pair being of substantial thickness and having a cyl1 A 12 lindrical outer rim and obliquely disposed contacting faces diverging therefrom and having ani REFERENCES CITED nular radially extensive faces on each side, in- The following references are of record in the 'dependent spacing members each having corre- 1"11e 0f this patent: sponding annular radially extensive faces con-1.5 tacting adjacent faces of the discs for effecting a UNITED STATES PATENTS broadening of the V-belt grooves by said un- Number Name Date changed discs, a set of bolts extending through 2,315,301 Van Deventer et ai. Mar. 30, 1943 the discs and spacers and the anges adjacent the 1,765,268 Hathaway J une 17, 1930 extensions, and another son of bolts extending 10 1,031,106 Camp Julyz, 1912 through said discs and spacers adjacent the 464,705 Dodge Dec. 3, 1891 groove-forming portions thereof. all said bolts 968,876 MOrriSSy et al Aug. 30, 1910 holding said discsl and spacers with their said 2,104,074 Erbach Jan. 4, 1938 faces contacting in an unyielding pulley mass and 1,792,733 De Wein Feb. 17, 1931 holding the entire pulley mass rotatably con- 15 464,795 Dodge Dec, 8, 1891 nected with the driven shaft. 1,740,087 Hall Dec. 17,, 1929A HOWARD O. WILLIAMS. 2,036,445 Torkelson Apr. 7, 1936 

